
/****************************************************************************/
/*Copyright (c) 2011, Florent DEVILLE.                                      */
/*All rights reserved.                                                      */
/*                                                                          */
/*Redistribution and use in source and binary forms, with or without        */
/*modification, are permitted provided that the following conditions        */
/*are met:                                                                  */
/*                                                                          */
/* - Redistributions of source code must retain the above copyright         */
/*notice, this list of conditions and the following disclaimer.             */
/* - Redistributions in binary form must reproduce the above                */
/*copyright notice, this list of conditions and the following               */
/*disclaimer in the documentation and/or other materials provided           */
/*with the distribution.                                                    */
/* - The names of its contributors cannot be used to endorse or promote     */
/*products derived from this software without specific prior written        */
/*permission.                                                               */
/* - The source code cannot be used for commercial purposes without         */ 
/*its contributors' permission.                                             */
/*                                                                          */
/*THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       */
/*"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT         */
/*LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS         */
/*FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE            */
/*COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,       */
/*INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,      */
/*BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;          */
/*LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER          */
/*CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT        */
/*LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN         */
/*ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE           */
/*POSSIBILITY OF SUCH DAMAGE.                                               */
/****************************************************************************/

#include "RTIPrimitive.h"

namespace RT
{

	void RTIPrimitive::applyViewMatrix(const RTMatrix44& view)
	{
		//set the world view matrix
		m_worldViewMatrix = m_worldMatrix * view;

		//calculate the inverse
		m_inverseWorldViewMatrix = m_worldViewMatrix.inverse();
	}

	void RTIPrimitive::setMatrices(const RTMatrix44& T, const RTMatrix44& R, const RTMatrix44& S)
	{
		//set world and rotation
		m_worldMatrix = S * R * T;
	
		//set inverses
		m_inverseWorldMatrix = m_worldMatrix.inverse();
	}

	/* set the world matrix of the RTPrimitive */
	void RTIPrimitive::setWorldMatrix(const RTMatrix44& world)
	{
		m_worldMatrix = world;
		m_inverseWorldMatrix = m_worldMatrix.inverse();
	}

	void RTIPrimitive::convertRayToLocalCoordinates(const RTRay& in, RTRay& out)const
	{
		RTVector4f direction(in.getDirection(), 0);
		direction = direction * m_inverseWorldViewMatrix;
		direction.normalize();
		out.setDirection(direction);

		out.setOrigin(in.getOrigin() * m_inverseWorldViewMatrix);
		out.getDirection().normalize();
	}

	//convert a ray from global coorindates to local coordinates
	void RTIPrimitive::globalToLocal(const RTRay& in, RTRay& out)const
	{
		RTVector4f direction(in.getDirection(), 0);
		direction = direction * m_inverseWorldMatrix;
		direction.normalize();
		out.setDirection(direction);

		out.setOrigin(in.getOrigin() * m_inverseWorldMatrix);

	}

	void RTIPrimitive::convertNormalToGlobalCoordinates(const RTVector3f& in, RTVector3f& out)const
	{
		RTVector4f temp(in, 0);
		out = temp * m_worldViewMatrix;
		out.normalize();
	}

	void RTIPrimitive::convertPointToLocalCoordinates(const RTVector3f& in, RTVector3f& out)const
	{
		out = in * m_inverseWorldViewMatrix;
	}

}